One form of this device that makes use of a helical spring and an object with two protruding vanes is named for Lionel Robert Wilberforce. Another setup, which is the coupled 
One form of this device that makes use of a helical spring and an object with two protruding vanes is named for Lionel Robert Wilberforce. Another setup, which is the coupled form of this device, connects two individual types of this object by a spring. Connecting two of these devices directly to one another can represent chaotic movement in the double variety of this object. For 10 points, name this type of object that most simply consists of a mass connected to a string that can swing in simple harmonic motion.
One form of this device that makes use of a helical spring and an object with two protruding vanes is named for Lionel Robert Wilberforce.
{pendulums}